That is the reason I posted the question, I planned (plan) on using 3 - 80 amp hr AGMs on my charity build. I saw these and wondered if they are as good/better than the AGMs for $50 more.
Application.
If the battery just sits, isn't moving around, then lead/acid works.
They are OK for fully charged back-up batteries that aren't getting deep cycled, but even 'Deep Cycle' just means they bounce back, they still only have so many cycles of life in them, the more you sue them the faster they go bad.
Gel or AGM are better for something getting bounced around, nothing to spill and plates that are captured and don't break as easily.
If you want to use the crap out of the batteries, LFP (LiFePo4) batteries have a 10 year warranty, give about 4 or 5 times the useable energy each cycle, don't have to be 100% recharged, hold voltage up as they are discharged, and are an all around better choice for someone that's going to use the crap out of their batteries.
100Ah runs about $990 from Battle Born, but with 10 times the life cycles of lead, and 4 or 5 times the useable energy, for solar system they are a viable choice (for off the shelf batteries).
A useable 100Ah without damage (not 20% of rating), for 10 years... And the protections built into the battery make it almost idiot proof.
The initial price is a SHOCK, but in the long run it's a MUCH better battery for solar power, and more cost effective.
It's also safer...
Consider space & weight, Something like Battle Born wins hands down.
If the application is standby power, and the lead/acid can stay fully charged,only used a little bit, then it's viable.
LFP can be partly charged, like on two or three cloudy days in a row, and still recharge with no damage to speak of, you leave a lead/acid deeply discharged for very long and it goes toes up, tag it and bag it.
Since solar homes are in constant use, there really isn't any such thing as '100% Charged' and on 'Float' (maintenance charge), in a solar system State of Charge (SoC) is constantly moving one direction or the other.
I WASN'T a believer in LFP and on the chemistry batteries 2 years ago when I installed a couple strings in my battery bank, I'm a believer now having delt with lead/acid for over 20 years off grid.